function filter (phrase, _id, colNr){
    var search = phrase.value.toLowerCase();
    var table = document.getElementById(_id);
    var elemnt;
     for (var r = 1; r < table.rows.length; r++){
      elemnt = table.rows[r].cells[colNr].innerHTML.replace(/<[^>]+>/g,"");
      if (elemnt.toLowerCase().indexOf(search)>=0 )
       table.rows[r].style.display = '';
      else table.rows[r].style.display = 'none'; 
     }
 }